The iabmeric trans-11, 12-dichloro-9, lO-dihydro-9, lO-ethano-l-anthroic acids (1 and 2) have been prepared and characterized. Base-induced dehydrochlorinations of these and the corresponding cis-dichloroethano derivatives 3 and 4 were conducted under several sets of base/solvent conditions. Preparations and dehydrochlorinations of 24 trans-ll, l2- dichloro-9, 10-dihydro-9, 10-ethano-9-anthryl] ethanoic acid (15) and the corresponding ...